## Weierstrass, Karl Wilhelm Theodor (1815–1897)Journal, on Abelian functions
which completed work that Niels Abel and Karl
Jacobi had begun. Its importance was immediately
recognized and Weierstrass was appointed a professor at the Royal Polytechnic
School and a lecturer at the University of Berlin. He went on to give the
first rigorous definitions of limit, derivative, differentiability, and
convergence, and investigated under what conditions a power series will
converge. ## Related category• MATHEMATICIANS | ||||||

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